Updated the Arduino + ChromeExtension Example#2

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Commits on Apr 5, 2015

Modified the blink.js script to make it work with the latest Chrome Serial API. Aditionally, added logic to keep checking for serial ports if the extension is launched before the arduino is connect…
Ghosh
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Updated the README.md
Kunal Ghosh
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Updated the README.md with the OS version
kunalghosh
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